[Qemu-devel] [PATCH] tests: fix cdrom_pio_impl in ide-test

[Peter Lieven <pl@kamp.de>]

The check for the cleared BSY flag has to be performed
before each data transfer and not just before the
first one.

Commit 5f81724d revealed this glitch as the BSY flag
was not set in ATAPI PIO transfers before.

While at it fix the desciptions and add a comment before
the nested for loop that transfers the data.

Signed-off-by: Peter Lieven <pl@kamp.de>
---
 tests/ide-test.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/tests/ide-test.c b/tests/ide-test.c
index d1014bb..fc1ce52 100644
--- a/tests/ide-test.c
+++ b/tests/ide-test.c
@@ -699,24 +699,19 @@ static void cdrom_pio_impl(int nblocks)
     outb(IDE_BASE + reg_lba_middle, BYTE_COUNT_LIMIT & 0xFF);
     outb(IDE_BASE + reg_lba_high, (BYTE_COUNT_LIMIT >> 8 & 0xFF));
     outb(IDE_BASE + reg_command, CMD_PACKET);
-    /* HPD0: Check_Status_A State */
+    /* HP0: Check_Status_A State */
     nsleep(400);
     data = ide_wait_clear(BSY);
-    /* HPD1: Send_Packet State */
+    /* HP1: Send_Packet State */
     assert_bit_set(data, DRQ | DRDY);
     assert_bit_clear(data, ERR | DF | BSY);
 
     /* SCSI CDB (READ10) -- read n*2048 bytes from block 0 */
     send_scsi_cdb_read10(0, nblocks);
 
-    /* HPD3: INTRQ_Wait */
+    /* HP3: INTRQ_Wait */
     ide_wait_intr(IDE_PRIMARY_IRQ);
 
-    /* HPD2: Check_Status_B */
-    data = ide_wait_clear(BSY);
-    assert_bit_set(data, DRQ | DRDY);
-    assert_bit_clear(data, ERR | DF | BSY);
-
     /* Read data back: occurs in bursts of 'BYTE_COUNT_LIMIT' bytes.
      * If BYTE_COUNT_LIMIT is odd, we transfer BYTE_COUNT_LIMIT - 1 bytes.
      * We allow an odd limit only when the remaining transfer size is
@@ -728,6 +723,11 @@ static void cdrom_pio_impl(int nblocks)
     for (i = 0; i < DIV_ROUND_UP(rxsize, limit); i++) {
         size_t offset = i * (limit / 2);
         size_t rem = (rxsize / 2) - offset;
+        /* HP2: Check_Status_B */
+        data = ide_wait_clear(BSY);
+        assert_bit_set(data, DRQ | DRDY);
+        assert_bit_clear(data, ERR | DF | BSY);
+        /* HP4: Transfer_Data */
         for (j = 0; j < MIN((limit / 2), rem); j++) {
             rx[offset + j] = le16_to_cpu(inw(IDE_BASE + reg_data));
         }
-- 
1.7.9.5